This is the only pic I have right now. The rough looking stuff in the bottom of the pic is a pile of sand... I put a heavy broom finish on the poured concrete.
The long section is 30" x 24'
The other section at top left of pic is 48" x 10'
the three footers are 6" x 10'
The picture helped. I come up with 1.4375 yards of concrete needed based off of a typical 4" slab. Supposing that your sand was slightly off in spots, that is the only difference I could see, as you were shooting for a 3" slab. I think they cheated you on concrete. I think I would invite the manager over to measure himself. I think they can do a dog pen section on the house when you're ready for the mud.
